| OCEAN FRONT APTS INCKey Colony Bch, FL · Active | Key Colony Bch, FL | Nonprofit | Sep 17, 1963 | Active |
| TALL OCEAN BEACH CONDOMINIUM APTS., INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Feb 10, 1967 | Active |
| GOLF CLUB CONDOMINIUM, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Feb 20, 1968 | Active |
| KEY COLONY BEACH COMMUNITY ASSOCIATION, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | May 24, 1971 | Active |
| THE CAY CONDOMINIUM INCKey Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Jun 19, 1973 | Active |
| CONTINENTAL INN CONDOMINIUM OF KEY COLONY BEACH, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Feb 25, 1974 | Active |
| CASA CLARA CONDOMINIUM ASSOCIATION, INC.Key Colony Bch, FL · Active | Key Colony Bch, FL | Nonprofit | Jan 20, 1975 | Active |
| SEA ISLE CONDOMINIUM ASSOCIATION, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Jul 23, 1975 | Active |
| MARATHON CONGREGATION OF JEHOVAH'S WITNESSES, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Nonprofit | Feb 9, 1976 | Inactive |
| BEACH FRONT PROPERTY CLUB, INCORPORATEDKey Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Jun 23, 1977 | Active |
| THE EGRET CONDOMINIUM ASSOCIATION, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | May 11, 1978 | Active |
| MONTE CHRISTO CONDOMINIUM ASSOCIATION, INC.Key Colony Bch, FL · Active | Key Colony Bch, FL | Nonprofit | Jul 16, 1979 | Active |
| KEY COLONY POINT CONDOMINIUM ASSOCIATION, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Apr 23, 1981 | Active |
| SEVENTH STREET, KEY COLONY BEACH, PROPERTY OWNERS ASSOCIATION, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Nonprofit | Jun 29, 1981 | Inactive |
| SEAPOINTE CONDOMINIUM ASSOCIATION, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | Jan 21, 1982 | Active |
| THE OCEAN BEACH CLUB TIME SHARE OWNER'S ASSOCIATION, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Nonprofit | Apr 7, 1982 | Inactive |
| KEY COLONY BEACH CLUB, INC.,Key Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | May 19, 1956 | Active |
| SUNSET BEACH APARTMENTS INCKey Colony Beach, FL · Active | Key Colony Beach, FL | Nonprofit | May 9, 1957 | Active |
| THE FLIGHT DEPARTMENT, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Dec 13, 1979 | Inactive |
| DEL LAYNE HOMES, INC.Hollywood, FL · Inactive | Hollywood, FL | Corporation | Nov 7, 1980 | Inactive |
| BILL AND SHELLEY PARTNERSHIP LP LTDKey Colony Beach, FL · Inactive | Key Colony Beach, FL | Partnership | Jul 6, 2004 | Inactive |
| CABO REALTY, LTD.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Partnership | Sep 14, 2005 | Inactive |
| LAMPE FAMILY INVESTMENTS, LTD.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Partnership | Dec 11, 2006 | Inactive |
| BIG PINE CYPRESS SWAMP LIMITED PARTNERSHIPMarathon, FL · Inactive | Marathon, FL | Partnership | Mar 7, 1986 | Inactive |
| ATLANTIC VILLAGE DEVELOPMENT COMPANY, A LIMITED PARTNERSHIPKey Colony Beach, FL · Inactive | Key Colony Beach, FL | Partnership | Oct 10, 1986 | Inactive |
| BENJAMIN POSNER FAMILY PARTNERSHIP, LTD.Tamarac, FL · Inactive | Tamarac, FL | Partnership | Jun 25, 1996 | Inactive |
| TAURSA FUND, L.P.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Partnership | Jul 12, 2001 | Inactive |
| UNIVERSAL TUBE & ROLLFORM EQUIPMENT CORPORATIONKey Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Feb 20, 2012 | Inactive |
| MARATHON AIR SERVICES, INC.Key Colony Bch, FL · Inactive | Key Colony Bch, FL | Corporation | Jan 9, 1981 | Inactive |
| ARCO BUSINESS ENTERPRISES, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Corporation | May 4, 2016 | Active |
| 101 OAK STREET FL CORP.Key Colony Beach, FL · Active | Key Colony Beach, FL | Corporation | Nov 29, 2016 | Active |
| J.G. SCHOLES TRUCKING, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Corporation | Dec 19, 2024 | Active |
| FIN SOM SNUS, INC.Key Colony Beach, FL · Active | Key Colony Beach, FL | Corporation | Mar 19, 2026 | Active |
| B&L OF KCB, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jul 28, 1982 | Inactive |
| GALILEO INVESTMENTS, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Feb 15, 1996 | Inactive |
| MAGIC CHUM, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Sep 13, 1982 | Inactive |
| CENTURY CLUB, INC.Key Colony Bch, FL · Inactive | Key Colony Bch, FL | Corporation | Jan 20, 1983 | Inactive |
| MID KEYS REALTY, INC.Key Colony Bch, FL · Inactive | Key Colony Bch, FL | Corporation | Aug 2, 1983 | Inactive |
| LA CAVE, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Nov 14, 1983 | Inactive |
| LAMPE TRADING, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jan 25, 1984 | Inactive |
| GLACIAL POOLS, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jan 5, 1984 | Inactive |
| ALGUS, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Feb 10, 1984 | Inactive |
| CONDO VAC INTERNATIONAL, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | May 9, 1984 | Inactive |
| MERCER INDUSTRIAL DESIGN, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jul 6, 1984 | Inactive |
| ANTHONY ELECTRIC, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jan 28, 1985 | Inactive |
| FINANCIAL CONTROL CORPORATIONKey Colony Bch, FL · Inactive | Key Colony Bch, FL | Corporation | Apr 23, 1985 | Inactive |
| EXECUTIVE ESCAPE BOATING COMPANY, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Jan 30, 1986 | Inactive |
| MARINER'S COVE MARINE SUPPLIES OF MARATHON, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Feb 13, 1986 | Inactive |
| BILLEN ENTERPRISES, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Feb 14, 1986 | Inactive |
| SHELTER KEY, INC.New Colony Beach, FL · Inactive | New Colony Beach, FL | Corporation | Feb 24, 1986 | Inactive |